(Z)-N-[(Z)-3-(2,5-Di­methyl­phenyl­imino)­butan-2-yl­idene]-2,5-di­methyl­aniline

The asymmetric unit of the title compound, C₂₀H₂₄N₂, contains one half-mol­ecule, with the single C-C bond of the 1,4-di­aza­butadiene fragment situated on a centre of symmetry. The benzene rings are inclined to the 1,4-di­aza­butadiene mean plane by 59.5 (1)°.

Bis(μ₂-di­phenyl­phosphinamide-κ²O:O)bis­[bis(di­phenyl­phosphinamide-κO)lithium] dichloride aceto­nitrile disolvate

The asymmetric unit of the title compound, [Li₂(C₁₂H₁₂NOP)₆]Cl₂·2CH₃CN, contains one-half of the centrosymmetric dication, one chloride anion and one aceto­nitrile solvent mol­ecule. Each Li atom is coordinated by four O atoms [Li—O 1.891 (3) and 2.025 (3) Å] from the four di­phenyl­phosphinamide ligands in a distorted tetra­hedral geometry. In the crystal, weak N—H...Cl hydrogen bonds link the anions and dications into columns extending along [100].

7,7-[Ethane-1,2-diylbis(oxy)]-2-[hydroxy(phenyl)methyl]bicyclo[3.3.1]nonan-3-one

In the title compound, C₁₈H₂₂O₄, the cyclo­hexane and cyclo­hexa­none rings adopt normal chair and half-chair conformations, respectively. The dioxolane ring is almost planar, with an r.m.s. deviation of 0.094 (3) Å. In the crystal, mol­ecules are connected by O—H...O hydrogen bonds, forming 2₁ helical chains along the a-axis direction. The chains are further connected by C—H...O hydrogen bonds.

Ethyl 2,6-bis­(4-chloro­phen­yl)-1-iso­cyano-4-oxo­cyclo­hexa­necarboxyl­ate

In the title compound, C₂₂H₁₉Cl₂NO₃, the central six-membered ring is in a twist-boat conformation. The two aryl groups are in equatorial positions, trans to each other and with a dihedral angle of 77.50 (2)° between them. One of the least hindered –CH₂– groups and one of the aryl-substituted C atoms, with its axial H atom, are in the flagpole positions. The eth­oxy­carbonyl group is in an equatorial position and is cis to the second aryl group. In the crystal, molecules are linked via weak C—H...O hydrogen bonds, forming chains along [010].

Ethyl 2,6-bis­(4-bromo­phen­yl)-1-iso­cyano-4-oxo­cyclo­hexa­necarboxyl­ate

In the title compound, C₂₂H₁₉Br₂NO₃, the central oxo­cyclo­hexane ring is in a twist-boat conformation; all the substituents (one eth­oxy­carbonyl and two aryl groups) are located in equatorial orientations. One of the –CH₂– groups and the opposite –CH– group bearing a bromo­benzene substituent form the flagpoles of the twist-boat. The dihedral angle between the aromatic rings is 76.4 (4)°. In the crystal, weak C—H...O inter­actions link the mol­ecules into C(5) chains propagating in the [010] direction. A short Br...O contact of 3.254 (4) Å is observed.